[PATCH AUTOSEL 6.14 192/642] r8169: increase max jumbo packet size on RTL8125/RTL8126

Sasha Levin
2025-05-05T22:21:51Z

From: Heiner Kallweit <hkallweit1@gmail.com>

[ Upstream commit 473367a5ffe1607a61be481e2feda684eb5faea9 ]

Realtek confirmed that all RTL8125/RTL8126 chip versions support up to
16K jumbo packets. Reflect this in the driver.

Tested by Rui on RTL8125B with 12K jumbo packets.

Suggested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Tested-by: Rui Salvaterra <rsalvaterra@gmail.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/396762ad-cc65-4e60-b01e-8847db89e98b@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/realtek/r8169_main.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 4ead966727734..485ecd62e585d 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -89,6 +89,7 @@
#define JUMBO_6K (6 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
#define JUMBO_7K (7 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
#define JUMBO_9K (9 * SZ_1K - VLAN_ETH_HLEN - ETH_FCS_LEN)
+#define JUMBO_16K (SZ_16K - VLAN_ETH_HLEN - ETH_FCS_LEN)

static const struct {
const char *name;
@@ -5353,6 +5354,9 @@ static int rtl_jumbo_max(struct rtl8169_private *tp)
/* RTL8168c */
case RTL_GIGA_MAC_VER_18 ... RTL_GIGA_MAC_VER_24:
return JUMBO_6K;
+ /* RTL8125/8126 */
+ case RTL_GIGA_MAC_VER_61 ... RTL_GIGA_MAC_VER_71:
+ return JUMBO_16K;
default:
return JUMBO_9K;
}
--
2.39.5